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Java is designed as a portable language ... for bigger systems ... so

LOTS of Private / Protected type stuff that's needed on data which means

LOTS more attention needed to interfacing and joining bits up and providing all that's needed

Because it's run lots of times, it's interpretted early not every time

Slower to start the first time, but then much quicker on the run

Methodology ... for development

Write the program into a .java

"Compile" it into a .class

Top level class must conform to Servlet or JSP standard (i.e. have the right hooks on it)

Test the classes

Build up all the classes in a (service) application into a .war

Methodology ... for deployment

Run a Tomcat or WebSphere server

Hook the .war file into the engine

However - it's fairly (!) portable.

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